
console.log("Hello wordld ");

var str = 4+5;
console.log("var");

str="阿斯顿";
console.log("str");

str = function(x,y){

    return x+y;
}



function add(a,b,c)
{

    return c(a,b);
}

var t = add(12,9,str);

console.log(t);




